Rhodamine-conjugated Arachis hypogaea (peanut agglutinin, PNA) lectin, which is specific for beta-D-galactosyl and beta-D-gal-[1,3]-D-galNAC residues, was used to identify osteoclasts in paraffin-embedded bone sections of fetal rat calvaria and a human bone-derived tumor, osteoclastoma. All